JOE.
Valve released a new CO-OP mode on TF2 called MANN vs MACHINE.
It's when you defeat HORDES of ROBOT enemies, same concept as a ZOMBIE game. Instead, with robots.
But everytime I tried to make or join a match today, i can never join it.
Maybe it's because everyone is updating, and it's the first day of the official launch.
I'll try maybe on the weekends.